热塑性聚氨酯弹性体与乙华平橡胶共混物的性能

将聚酯型和聚醚型聚氨酯弹性体(TPU385E,TPU8685)分别与不同乙酸乙烯酯含量的乙华平橡胶(EVM400,EVM700)进行共混,考察了原料种类、共混比对共混物力学性能和耐磨性的影响。结果表明,随着TPU用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均提高,扯断伸长率下降;随着EVM用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均降低,扯断伸长率增大;随着TPU用量的增加,EVM/TPU共混物的耐磨性提高;TPU8685/EVM400共混物具有最大的拉伸强度,TPU385E/EVM700共混物具有最大的扯断伸长率,TPU8685/EVM700共混物具有最好的耐磨性;当2种TPU与EVM400质量比都为50/50时,TPU385E/EVM400的耐磨性最差。     

NBR/PVC热塑性弹性体的耐油性能研究

考察了硫化剂种类及用量、橡塑比和PVC的相对分子质量对NBR／PVC热塑性弹性体(TPE)耐油性能的影响。实验结果表明，TCY(三聚硫氰酸)硫化体系制备的NBR／PVC的耐油性能最好，TMTD(二硫化四甲基秋兰姆)体系次之，酚醛树脂和硫磺2种体系最差；TCY的用量越大，TPE的耐油性越强，其最佳用量为2．0份；橡塑比中PVC所占比例增大，TPE的耐油性下降；增加PVC的相对分子质量，TPE的耐油性明显提高。     

热塑性聚氨酯弹性体与ABS共混物的力学性能

通过融熔共混法制备了TPU／ABS共混物。对共混比例为0／100，5／95，7／93，10／90，20／80，30／70和40／60的共混物的力学性能进行研究，发现材料的抗冲性能得到改善，在比例为20／80时冲击强度达到最大，同时其它的力学性能下降。     

乙烯-醋酸乙烯酯共聚物的共混与增容

乙烯-醋酸乙烯酯共聚物是一种类似橡胶弹性体的热塑性聚合物。由于它极好的柔软性、强韧性和优异的耐热耐低温性、耐臭氧和耐天侯老化以及良好的加工性能,多种树脂或橡胶可与其共混进行改性。通过加入增容剂,引入能相互作用的基团等方法使共混物的相容性提高,进而提高共混物的力学性能。     

热塑性聚氨酯弹性体与塑料的共混体系

本文简述了热塑性聚氨酯弹性体(TPU)与聚氯乙烯(PVC)、聚甲醛(POM)和聚碳酸酯(PC)的共混工艺以及共混物的物理机械性能。结果表明,TPU/PVC、TPU/POM、TPU/PC共混物的性能优异,极具发展潜力。     

热塑性聚氨酯与弹性体的共混及应用

本文简要论述了热塑性聚氨酯和苯乙烯嵌段共聚物的结构与性能。在分析聚合物共混的基本条件如混溶性与相容性的基础上,介绍了热塑性聚氨酯与热塑性弹性体(如苯乙烯嵌段共聚物)的共混方法及设备,并对其共混效果与应用作了简单的介绍。     

橡塑共混型热塑性弹性体

橡塑共混型热塑性弹性体《橡塑共混型热塑性弹性体》是由印度卡拉格普尔的印度工学院和橡胶技术中心的．Ｓ．Ｋ．Ｄｅ教授和Ａｎｌｋ．Ｂｈｏｗｍｉｃｋ教授合编，于１９９０年由英格兰ＥｌｌｉｓＨｏｒｗｏｏｄ有限公司出版，化工部北京橡胶工业研究设计院技术图书馆藏。...     

热塑性聚氨酯弹性体的共混改性研究进展

综述了热塑性聚氨酯弹性体（TPU）与其它聚合物及刚性粒子的共混改性研究进展,利用TPU的一些优异的物性改善其它聚合物的性能,或采用其它聚合物的某一突出性能来弥补TPU的某些性能缺陷,同时降低TPU的成本。     

Thermoplastic Elastomer Composites of Palm Ash-Filled Ethylene Vinyl Acetate/Natural Rubber Blends: Effects of Palm Ash Loading and Size

Thermoplastic elastomer composites of ethylene vinyl acetate (EVA)/natural rubber (NR) blends filled with palm ash were prepared by melt-mixing using a Haake Rheomix Polydrive R600/610 at 120°C with rotor speed of 50 rpm for 10 minutes. Increase in palm ash loading in composites resulted in increase the value of stabilization toque, Young's modulus and swelling resistance of the composites, but decreased the tensile strength and elongation at break. Scanning electron microscope micrographs revealed that higher filler loading resulted in agglomeration of palm ash in the composites. When smaller particle size of palm ash was used, further improvement in tensile strength, elongation at break, swelling resistance and stabilization torque value were observed.     

影响热塑性聚氨酯弹性体性能的因素浅析

对影响热塑性聚氨酯弹性体性能的因素进行了分析和讨论,包括多元醇的结构和相对分子质量、异氰酸酯和扩链剂种类、扩链系数、硬段含量、氢键、催化剂等。提出在生产热塑性聚氨酯弹性体过程中要对体系配方进行科学设计。     

Study on Blends of Ethylene Propylene Diene Rubber and Thermoplastic Polyurethanes

Blends of ethylene propylene diene rubber (EPDM) and thermoplastic polyurethane (TPU) have been studied to understand the compatibility and morphology. The study was initially done with unmodified EPDM and subsequently with modified EPDM through maleation process. Mechanical properties of unmodified EPDM blends are improved with the addition of TPU. However, the appearance of two T _gs even at lower concentrations of PU in the blends indicates that the blends are incompatible. Blends of maleated EPDM with TPU showed a single T _g and further improvement in mechanical properties which is attributed to the improvement in compatibility as also confirmed by SEM analysis.     

硅橡胶/TPU动态硫化热塑性弹性体的配方和加工工艺的研究

以热塑性聚氨酯弹性体(TPU)和有机硅橡胶(SIR)为基体,通过Hakke密炼机采用动态硫化的方法制备了热塑性弹性体(TPV)。研究了不同制备条件下得到的TPV的性能。结果表明,TPU/SIR共混物质量比为50∶50、密炼机加工温度为180℃、转速为70 r/min、硫化时间为4 min时,TPV的加工性能、力学性能、毛细管流变性能和微观形态达到一个较好的平衡点。     

聚氨酯微孔弹性体模塑用硅油型脱模剂的研制

采用八甲基环四硅氧烷(D4)、六甲基硅氧烷(MM)等主要原料制备了硅油脱模剂。介绍了硅油脱模剂的技术指标、制备工艺及制品的性能,讨论了影响制品性能的因素。结果表明该硅油脱模剂性能良好,可广泛应用于PU、ABS和橡胶模塑制品的脱模。     

PPDI型热塑性聚氨酯弹性体的制备与性能研究

以对苯二异氰酸酯(PPDI)、低聚物二元醇和1,4-丁二醇为原料合成PPDI型热塑性聚氨酯弹性体(TPU),考察了软段种类和相对分子质量、硬段含量、R值(n(NCO)∶n(OH))等对其性能的影响,并与MDI型TPU的动态力学性能作比较.结果表明,聚ε-己内酯(PCL)体系TPU具有良好的性能,硬段含量和R值的提高均可...     

Comparison Properties of Natural Rubber (SMR L)/Ethylene Vinyl Acetate (EVA) Copolymer Blends and Epoxidized Natural Rubber (ENR-50)/Ethylene Vinyl Acetate (EVA) Copolymer Blends

Mixing torque, morphology, tensile properties and swelling studies of natural rubber/ethylene vinyl acetate copolymer blends were studied. Two series of unvulcanized blends, natural rubber/ethylene vinyl acetate (SMRL/EVA) copolymer blend and epoxidized natural rubber (50% epoxidation)/ethylene vinyl acetate (ENR-50/EVA) copolymer blend were prepared. Blends were prepared using a laboratory internal mixer, Haake Rheomix polydrive with rotor speed of 50 rpm at 120°C. Results indicated that mixing torque value and stabilization torque value in ENR-50 blends are lower than SMRL blends. The process efficiency of ENR-50/EVA blends is better due to less viscous nature of the blend compared to SMRL/EVA blends as indicated in stabilization torque graph. Tensile properties like tensile strength, M100 (modulus at 100% elongation) and E _b (elongation at break) increase with increasing EVA fraction in the blend. At the similar blend composition, ENR-50 blend shows better tensile properties than SMRL blends. In oil resistance test, swelling percentage increased with immersion time and rubber composition. At a similar immersion time, ENR-50 blends exhibit better oil resistance compared to SMRL blends. Scanning electron microscopy (SEM) of tensile fractured surface indicated that EVA/ENR-50 blends need higher energy to cause catastrophic failure compared to EVA/SMRL blends. In etched cryogenically fractured surface, size and distribution of holes due to extraction of rubber phase by methyl ethyl ketone (MEK) were studied and holes became bigger as rubber composition increased due to coalescence of rubber particle.     

HPVC/ABS热塑性弹性体性能研究

使用CPE(氯化聚乙烯)、NBR(天然橡胶)、EVACO(乙烯-醋酸乙烯-一氧化碳三元共聚物)增容高聚合度聚氯乙烯(HPVc)/ABs(丙烯脯一丁二烯·苯乙烯共聚物.即高胶粉)弹性体.研究了增容共混体系的力学、耐油、耐溶剂,热空气老化以及加工流变性能,结果表明,增容共混改性后,增塑剂耐异辛烷抽出能力提高,油酸中损失质量分散减小,改性后材料加工流动性能变差;HPVC与ABS质量比在100·(10～20)体系综合性能较佳.     

EVM改性硅橡胶耐油性和耐热性的研究

采用乙烯-醋酸乙烯酯橡胶(EVM)共混改性硅橡胶,研究了其共混比对胶料耐油性和耐热性的影响。结果表明,随着EVM用量的增加,共混胶料的力学性能得到改善。在ASTM 1#和ASTM 3#油中浸泡后,体积变化率和硬度变化呈现下降趋势,提高了硅橡胶的耐油性能。热分析表明,随着EVM用量的增加,硫化胶的分解温度下降,耐热性有所降低。DMA数据显示,加入EVM后共混胶料的低温性能下降,损耗因子变大。     

国内外汽车用热塑性弹性体材料的发展现状

综述了国内外汽车用热塑性弹性体材料的发展现状。包括TPO在保险杠、仪表盘等的应用;TPV在门窗密封条、窗玻璃槽角件等的应用;TPEE在等速万向节护套、各种护罩等的应用;TPU在减震垫、各种轴套等的应用;TPS材料在胶管、密封垫等的应用。为了响应汽车环保、轻量化的发展趋势,我国应创造条件,使汽车用热塑性弹性体材料向高性能化、专用化和本土化方向发展。